if you dont mind I just want to ask what level and BP are you when u do this instance? Because certain instance requires certain power despite of the fact that the power requirement is not specified.

I'm lv 85 with 45.5k power and indeed it's so ez for me. I 1 hit the entire team with my lightning main running thirst blood. So I think an appropriate power for this instance should be around 38 or 39k or it would more easier for you if can get to 40k.